We just found multiple pin hole leaks in Carbon Steel tubing in our HVAC unit. The tubes carry 50# of steam (might have trace amounts of cyclohexlamine and hydrazine (.1-.2 ppm) at ~300 F. Aluminum fins are touching (not actually attached) the steel and most (if not all) of the pinholes are located beneath the aluminum fins. I'm concerned about galvanic corrosion but don't think it could be that since the Aluminum is the more active metal. Could erosion-corrosion cause these pinholes? Maybe it's just localized corrosion? Finally, could galvanic corrosion occur at this location? Any information would help! Thanks!
Red Flag Submitted
Thank you for helping keep Eng-Tips Forums free from inappropriate posts. The Eng-Tips staff will check this out and take appropriate action.
Reply To This Thread
Posting in the Eng-Tips forums is a member-only feature.